施有志, 华建兵, 连宇新, 林树枝. 2018: 地铁深基坑施工扰动下邻近管线安全评价及保护措施. 工程地质学报, 26(4): 1043-1053. DOI: 10.13544/j.cnki.jeg.2017-295
    引用本文: 施有志, 华建兵, 连宇新, 林树枝. 2018: 地铁深基坑施工扰动下邻近管线安全评价及保护措施. 工程地质学报, 26(4): 1043-1053. DOI: 10.13544/j.cnki.jeg.2017-295
    SHI Youzhi, HUA Jianbing, LIAN Yuxin, LIN Shuzhi. 2018: SAFETY EVALUATION AND PROTECTION MEASURES TO ADJACENT PIPELINES DURING DEEP EXCAVATION FOR METRO CONSTRUCTION. JOURNAL OF ENGINEERING GEOLOGY, 26(4): 1043-1053. DOI: 10.13544/j.cnki.jeg.2017-295
    Citation: SHI Youzhi, HUA Jianbing, LIAN Yuxin, LIN Shuzhi. 2018: SAFETY EVALUATION AND PROTECTION MEASURES TO ADJACENT PIPELINES DURING DEEP EXCAVATION FOR METRO CONSTRUCTION. JOURNAL OF ENGINEERING GEOLOGY, 26(4): 1043-1053. DOI: 10.13544/j.cnki.jeg.2017-295

    地铁深基坑施工扰动下邻近管线安全评价及保护措施

    SAFETY EVALUATION AND PROTECTION MEASURES TO ADJACENT PIPELINES DURING DEEP EXCAVATION FOR METRO CONSTRUCTION

    • 摘要: 为研究深基坑施工对邻近管线影响程度,判断其安全度,并提出保护措施,以厦门地铁1号线某车站深基坑为依托,考虑土体小应变、地层不均匀分布及土-管线刚度差异等特性,建立三维有限元模型,并以管线沉降的实测值与计算值进行对比,验证计算方法的合理性,在此基础上,分别研究不同材质、直径的管线在基坑开挖过程的变形及内力,对不安全的管线提出不同保护方案,通过数值模拟选择最优保护方案。研究表明:管线的变形和轴力变化受基坑施工三维时空效应的影响显著,最大变形部位与地形最大变形区域一致;以管线允许转角、最大拉力的安全控制标准值为依据,判断DN1000的混凝土给水管处于不安全状态,最后采用的保护方案为:全长管线四周进行2 m×2 m的注浆加固,同时在主要沉降段的管线两侧打入各两排预制管桩。

       

      Abstract: Three-dimensional finite element models with consideration of soil small strain stiffness characteristics and the thickness variation of soil layers were developed to investigate the effect of excavation of urban square of metro line 1 to adjacent pipelines in Xiamen city. The models were applied to investigate the safety of deep metro excavation. Protection measures based on the result of models were proposed. Then the computation results were compared with the real-time monitoring data to verify the model accuracy. Based on the models, the effect of pipeline material and diameter on deformation and endogenous force was analyzed. Different protection schemes for unsafe pipelines were proposed. The best alternatives were proposed by numerical simulation. It was shown that the influence of three-dimensional space-time effect on deformations and axial force of pipelines was significant. Taking safety threshold of relative angle and tensile stress as standards, the DN1000 was under unsafe condition. The protection measures of 2m×2m grouting reinforcement and two rows of prefabricated pipe pile near pipelines settlement were adopted.

       

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